Another RPI3 panic: Assertion td->td_lock == TDQ_LOCKPTR(tdq)

[bob prohaska]

On Fri, Feb 02, 2018 at 11:06:11PM -0800, bob prohaska wrote:
> On Sun, Jan 28, 2018 at 12:25:54PM -0800, bob prohaska wrote:
> > For the second time during an OS build attempt a Pi3 running r328436 has
> > crashed with 
> > 
> > panic: Assertion td->td_lock == TDQ_LOCKPTR(tdq) failed at /usr/src/sys/kern/sched_ule.c:2019
> > 
> > Console, top and build logs are at
> > http://www.zefox.net/~fbsd/rpi3/crashes/20180128/
> > 
> > The log files are from kernel building. Unfortunately I didn't
> > capture the world build console and log. 
> 
> Happened again on r328519, this time compiling firefox-esr. 
> Console, top and log at
> http://www.zefox.net/~fbsd/rpi3/crashes/20180202/
> 

Got the kenel up to r328935 (by itself, using make kernel-toolchain and j2)
but still seeing the same panic with -j4 on buildworld. 

Seemingly nobody else is seeing this, could the problem be local to my setup?
Latest console and top window at 
http://www.zefox.net/~fbsd/rpi3/crashes/20180207/

Thanks for reading, and any counsel!

bob prohaska